Ptolemy Eupator was the son of Ptolemy VI Philometor

Ptolemy VI Philometor

Ptolemy VI Philometor was a king of Egypt from the Ptolemaic period. He reigned from 180 to 145 BC....

 and Cleopatra II, and for a short time in 152 BCE reigned as co-ruler with his father. It is thought that Ptolemy Eupator died in August of that same year.

Eupator is attested on small number of documents and inscriptions: he is mentioned in a demotic

Demotic

Demotic may refer to:*Demotic Greek, a variety of the Greek language*Demotic , a script and stage of the Egyptian language...

 papyrus held by the British Museum

British Museum

The British Museum is a museum of human history and culture in London. Its collections, which number more than seven million objects, are amongst the largest and most comprehensive in the world and originate from all continents, illustrating and documenting the story of human culture from its...

, is referenced as a priest during 158-157 BCE, and that he was a co-regent with his father in 152 BCE. Eupator was probably aged 12 or 13 when he died. He also appears in a list of deified

Imperial cult

An imperial cult is a form of state religion in which an emperor, or a dynasty of emperors , are worshipped as messiahs, demigods or deities. "Cult" here is used to mean "worship", not in the modern pejorative sense...

 Ptolemies.

When he was first discovered, there was a theory that he was an elder brother of his father, and reigned before him. As a result, some 19th century texts count Ptolemy Philometor as "Ptolemy VII" (instead of "Ptolemy VI"), and increment the numbers of all later Ptolemies by one until "Ptolemy XVI Caesarion

Caesarion

Ptolemy XV Philopator Philometor Caesar , better known by the nicknames Caesarion and Ptolemy Caesar , was the last king of the Ptolemaic dynasty of Egypt, who reigned jointly with his mother Cleopatra VII of Egypt, from September 2, 44 BC...

" (instead of "Ptolemy XV"). The epithets, which have come down from antiquity, are unchanged.